1 | // |
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2 | // MD5Engine.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/MD5Engine.cpp#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Crypt |
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8 | // Module: MD5Engine |
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9 | // |
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10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | // |
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36 | // MD5 (RFC 1321) algorithm: |
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37 | // Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All |
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38 | // rights reserved. |
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39 | // |
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40 | // License to copy and use this software is granted provided that it |
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41 | // is identified as the "RSA Data Security, Inc. MD5 Message-Digest |
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42 | // Algorithm" in all material mentioning or referencing this software |
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43 | // or this function. |
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44 | // |
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45 | // License is also granted to make and use derivative works provided |
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46 | // that such works are identified as "derived from the RSA Data |
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47 | // Security, Inc. MD5 Message-Digest Algorithm" in all material |
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48 | // mentioning or referencing the derived work. |
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49 | // |
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50 | // RSA Data Security, Inc. makes no representations concerning either |
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51 | // the merchantability of this software or the suitability of this |
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52 | // software for any particular purpose. It is provided "as is" |
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53 | // without express or implied warranty of any kind. |
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54 | // |
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55 | // These notices must be retained in any copies of any part of this |
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56 | // documentation and/or software. |
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57 | // |
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58 | |
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59 | |
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60 | #include "Poco/MD5Engine.h" |
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61 | #include <cstring> |
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62 | |
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63 | |
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64 | namespace Poco { |
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65 | |
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66 | |
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67 | MD5Engine::MD5Engine() |
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68 | { |
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69 | _digest.reserve(16); |
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70 | reset(); |
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71 | } |
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72 | |
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73 | |
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74 | MD5Engine::~MD5Engine() |
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75 | { |
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76 | reset(); |
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77 | } |
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78 | |
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79 | |
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80 | void MD5Engine::updateImpl(const void* input_, unsigned inputLen) |
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81 | { |
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82 | const unsigned char* input = (const unsigned char*) input_; |
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83 | unsigned int i, index, partLen; |
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84 | |
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85 | /* Compute number of bytes mod 64 */ |
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86 | index = (unsigned int)((_context.count[0] >> 3) & 0x3F); |
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87 | |
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88 | /* Update number of bits */ |
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89 | if ((_context.count[0] += ((UInt32) inputLen << 3)) < ((UInt32) inputLen << 3)) |
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90 | _context.count[1]++; |
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91 | _context.count[1] += ((UInt32) inputLen >> 29); |
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92 | |
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93 | partLen = 64 - index; |
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94 | |
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95 | /* Transform as many times as possible. */ |
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96 | if (inputLen >= partLen) |
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97 | { |
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98 | std::memcpy(&_context.buffer[index], input, partLen); |
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99 | transform(_context.state, _context.buffer); |
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100 | |
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101 | for (i = partLen; i + 63 < inputLen; i += 64) |
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102 | transform(_context.state, &input[i]); |
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103 | |
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104 | index = 0; |
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105 | } |
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106 | else i = 0; |
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107 | |
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108 | /* Buffer remaining input */ |
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109 | std::memcpy(&_context.buffer[index], &input[i],inputLen-i); |
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110 | } |
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111 | |
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112 | |
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113 | unsigned MD5Engine::digestLength() const |
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114 | { |
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115 | return DIGEST_SIZE; |
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116 | } |
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117 | |
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118 | |
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119 | void MD5Engine::reset() |
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120 | { |
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121 | std::memset(&_context, 0, sizeof(_context)); |
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122 | _context.count[0] = _context.count[1] = 0; |
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123 | _context.state[0] = 0x67452301; |
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124 | _context.state[1] = 0xefcdab89; |
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125 | _context.state[2] = 0x98badcfe; |
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126 | _context.state[3] = 0x10325476; |
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127 | } |
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128 | |
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129 | |
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130 | const DigestEngine::Digest& MD5Engine::digest() |
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131 | { |
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132 | static const unsigned char PADDING[64] = |
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133 | { |
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134 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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135 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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136 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
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137 | }; |
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138 | unsigned char bits[8]; |
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139 | unsigned int index, padLen; |
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140 | |
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141 | /* Save number of bits */ |
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142 | encode(bits, _context.count, 8); |
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143 | |
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144 | /* Pad out to 56 mod 64. */ |
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145 | index = (unsigned int)((_context.count[0] >> 3) & 0x3f); |
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146 | padLen = (index < 56) ? (56 - index) : (120 - index); |
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147 | update(PADDING, padLen); |
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148 | |
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149 | /* Append length (before padding) */ |
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150 | update(bits, 8); |
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151 | |
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152 | /* Store state in digest */ |
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153 | unsigned char digest[16]; |
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154 | encode(digest, _context.state, 16); |
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155 | _digest.clear(); |
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156 | _digest.insert(_digest.begin(), digest, digest + sizeof(digest)); |
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157 | |
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158 | /* Zeroize sensitive information. */ |
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159 | std::memset(&_context, 0, sizeof (_context)); |
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160 | reset(); |
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161 | return _digest; |
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162 | } |
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163 | |
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164 | |
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165 | /* Constants for MD5Transform routine. */ |
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166 | #define S11 7 |
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167 | #define S12 12 |
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168 | #define S13 17 |
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169 | #define S14 22 |
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170 | #define S21 5 |
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171 | #define S22 9 |
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172 | #define S23 14 |
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173 | #define S24 20 |
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174 | #define S31 4 |
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175 | #define S32 11 |
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176 | #define S33 16 |
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177 | #define S34 23 |
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178 | #define S41 6 |
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179 | #define S42 10 |
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180 | #define S43 15 |
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181 | #define S44 21 |
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182 | |
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183 | |
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184 | /* F, G, H and I are basic MD5 functions. */ |
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185 | #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) |
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186 | #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) |
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187 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
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188 | #define I(x, y, z) ((y) ^ ((x) | (~z))) |
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189 | |
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190 | |
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191 | /* ROTATE_LEFT rotates x left n bits. */ |
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192 | #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) |
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193 | |
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194 | |
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195 | /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. |
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196 | Rotation is separate from addition to prevent recomputation. */ |
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197 | #define FF(a, b, c, d, x, s, ac) { \ |
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198 | (a) += F ((b), (c), (d)) + (x) + (UInt32)(ac); \ |
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199 | (a) = ROTATE_LEFT ((a), (s)); \ |
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200 | (a) += (b); \ |
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201 | } |
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202 | #define GG(a, b, c, d, x, s, ac) { \ |
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203 | (a) += G ((b), (c), (d)) + (x) + (UInt32)(ac); \ |
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204 | (a) = ROTATE_LEFT ((a), (s)); \ |
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205 | (a) += (b); \ |
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206 | } |
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207 | #define HH(a, b, c, d, x, s, ac) { \ |
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208 | (a) += H ((b), (c), (d)) + (x) + (UInt32)(ac); \ |
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209 | (a) = ROTATE_LEFT ((a), (s)); \ |
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210 | (a) += (b); \ |
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211 | } |
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212 | #define II(a, b, c, d, x, s, ac) { \ |
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213 | (a) += I ((b), (c), (d)) + (x) + (UInt32)(ac); \ |
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214 | (a) = ROTATE_LEFT ((a), (s)); \ |
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215 | (a) += (b); \ |
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216 | } |
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217 | |
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218 | |
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219 | void MD5Engine::transform (UInt32 state[4], const unsigned char block[64]) |
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220 | { |
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221 | UInt32 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; |
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222 | |
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223 | decode(x, block, 64); |
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224 | |
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225 | /* Round 1 */ |
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226 | FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ |
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227 | FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ |
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228 | FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ |
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229 | FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ |
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230 | FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ |
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231 | FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ |
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232 | FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ |
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233 | FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ |
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234 | FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ |
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235 | FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ |
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236 | FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ |
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237 | FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ |
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238 | FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ |
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239 | FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ |
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240 | FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ |
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241 | FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ |
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242 | |
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243 | /* Round 2 */ |
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244 | GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ |
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245 | GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ |
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246 | GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ |
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247 | GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ |
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248 | GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ |
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249 | GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ |
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250 | GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ |
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251 | GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ |
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252 | GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ |
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253 | GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ |
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254 | GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ |
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255 | GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ |
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256 | GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ |
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257 | GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ |
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258 | GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ |
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259 | GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ |
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260 | |
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261 | /* Round 3 */ |
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262 | HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ |
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263 | HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ |
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264 | HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ |
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265 | HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ |
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266 | HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ |
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267 | HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ |
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268 | HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ |
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269 | HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ |
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270 | HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ |
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271 | HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ |
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272 | HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ |
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273 | HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ |
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274 | HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ |
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275 | HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ |
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276 | HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ |
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277 | HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ |
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278 | |
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279 | /* Round 4 */ |
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280 | II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ |
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281 | II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ |
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282 | II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ |
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283 | II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ |
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284 | II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ |
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285 | II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ |
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286 | II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ |
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287 | II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ |
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288 | II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ |
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289 | II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ |
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290 | II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ |
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291 | II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ |
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292 | II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ |
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293 | II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ |
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294 | II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ |
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295 | II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ |
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296 | |
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297 | state[0] += a; |
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298 | state[1] += b; |
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299 | state[2] += c; |
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300 | state[3] += d; |
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301 | |
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302 | /* Zeroize sensitive information. */ |
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303 | std::memset(x, 0, sizeof(x)); |
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304 | } |
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305 | |
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306 | |
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307 | void MD5Engine::encode(unsigned char* output, const UInt32* input, unsigned int len) |
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308 | { |
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309 | unsigned int i, j; |
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310 | |
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311 | for (i = 0, j = 0; j < len; i++, j += 4) |
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312 | { |
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313 | output[j] = (unsigned char)(input[i] & 0xff); |
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314 | output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); |
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315 | output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); |
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316 | output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); |
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317 | } |
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318 | } |
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319 | |
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320 | |
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321 | void MD5Engine::decode(UInt32* output, const unsigned char* input, unsigned int len) |
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322 | { |
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323 | unsigned int i, j; |
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324 | |
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325 | for (i = 0, j = 0; j < len; i++, j += 4) |
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326 | output[i] = ((UInt32)input[j]) | (((UInt32)input[j+1]) << 8) | |
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327 | (((UInt32)input[j+2]) << 16) | (((UInt32)input[j+3]) << 24); |
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328 | } |
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329 | |
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330 | |
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331 | } // namespace Poco |
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